UK Civil Aviation Authority Outlines Electronic Conspicuity Plans for Uncrewed and Crewed Aircraft

Why It Matters

It establishes the regulatory foundation for large‑scale UAS operations in UK airspace, shaping industry investment, safety standards, and the balance between manned and unmanned traffic.

Key Takeaways

• CAA mandates 978 MHz ADS‑B for BVLOS UAS.
• Crewed aircraft under 140 kt need 1090 MHz broadcast.
• Faster crewed aircraft require Mode S with higher SIL/SDA.
• GA community objects to mandatory EC costs.
• Mixed equipage may create safety blind spots.

Pulse Analysis

The push to integrate beyond‑visual‑line‑of‑sight (BVLOS) drones into national airspace has accelerated worldwide as logistics, infrastructure inspection, and emergency services seek the efficiency of unmanned aircraft. Traditional see‑and‑avoid methods, which rely on a pilot’s visual perception, are inadequate for small, fast‑moving UAS that can easily elude a crewed aircraft’s field of view. Electronic conspicuity (EC) – essentially a digital “light house” that broadcasts an aircraft’s position – offers a scalable solution, enabling automated detect‑and‑avoid (DAA) systems to function alongside existing traffic‑management tools such as ADS‑B and TCAS.

The UK Civil Aviation Authority’s Technical Concept of Operations codifies that requirement. Uncrewed aircraft operating BVLOS must emit a 978 MHz UAT ADS‑B signal compliant with DO‑282B standards and be equipped with ADS‑B IN receivers capable of decoding both 978 MHz and 1090 MHz transmissions. Crewed aircraft are split by speed: slower machines (<140 kt) broadcast on 1090 MHz with a minimum SIL 1/SDA 1, while faster platforms (>140 kt) must use Mode S transponders with higher SIL 3/SDA 2. Notably, inbound ADS‑B IN remains optional for manned aircraft, creating a potential “mixed‑equipage” environment.

The consultation revealed strong resistance, especially from the general aviation community, which argues that mandatory EC hardware imposes disproportionate costs on pilots who see limited benefit. Glider and paramotor operators highlighted maneuverability constraints that render collision avoidance ineffective even with EC data. Safety advocates warn that aircraft lacking ADS‑B IN could encounter blind spots, increasing the risk of unpredictable avoidance maneuvers. Balancing these concerns will shape the UK’s path toward a harmonised airspace where drones and traditional aircraft coexist, and will likely influence regulatory approaches across Europe and beyond.